____________ is the minimum trap seal for a shower?

The minimum trap seal for a shower is established at 2 inches. This measurement is crucial because it ensures that there is sufficient water in the trap to effectively seal off the drain from sewer gases and odors while maintaining adequate flow of wastewater. A trap seal of 2 inches is typically required to provide an effective barrier against these gases, given the potential for evaporation over time and the design of the plumbing system.

Having a trap seal of less than 2 inches may not prevent sewer gas from entering the living space effectively, which could lead to health hazards as well as unpleasant odors. A larger trap seal helps mitigate these risks while accommodating the volume of wastewater generated by typical shower use. The plumbing codes, including those applicable in Omaha, are designed to ensure the safety and sanitation of plumbing systems, thus setting the minimum requirements for trap seals at standards that promote public health.